Pearl, R. (1926). Vital Statistics of the National Academy of Sciences: V. The Growth of the Academy.
Dyfyniad Arddull ChicagoPearl, Raymond. Vital Statistics of the National Academy of Sciences: V. The Growth of the Academy. 1926.
Dyfyniad MLAPearl, Raymond. Vital Statistics of the National Academy of Sciences: V. The Growth of the Academy. 1926.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.